MTK Android12自定义修改WiFi/LTE RSSI信号格阀值

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我是靠谱客的博主飘逸电脑，最近开发中收集的这篇文章主要介绍MTK Android12自定义修改WiFi/LTE RSSI信号格阀值，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

WIFI 的修改

修改代码路径

packages/modules/Wifi/service/ServiceWifiResources/res/values/config.xml

修改逻辑

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  	......
    <integer-array translatable="false" name="config_wifiRssiLevelThresholds">
                         <!-- RSSI                RSSI Level -->
        <item>-88</item> <!-- (-infinity, -88)             0 -->
        <item>-85</item> <!-- [-88, -85)                   1 -->
        <item>-75</item> <!-- [-85, -75)                   2 -->
        <item>-60</item> <!-- [-75, -60)                   3 -->
                         <!-- [-60, +infinity)             4 -->
    </integer-array>
   	......
</resources>

按照需求修改以上阀值即可

原理简析

涉及的代码

packages/modules/Wifi/framework/java/android/net/wifi/WifiManager.java
packages/modules/Wifi/service/java/com/android/server/wifi/WifiServiceImpl.java
packages/modules/Wifi/service/java/com/android/server/wifi/util/RssiUtil.java

WifiManager.java
看代码中注释1-1

    /**
     * Given a raw RSSI, return the RSSI signal quality rating using the system default RSSI
     * quality rating thresholds.
     * @param rssi a raw RSSI value, in dBm, usually between -55 and -90
     * @return the RSSI signal quality rating, in the range
     * [0, {@link #getMaxSignalLevel()}], where 0 is the lowest (worst signal) RSSI
     * rating and {@link #getMaxSignalLevel()} is the highest (best signal) RSSI rating.
     */
    @IntRange(from = 0)
    public int calculateSignalLevel(int rssi) {
        try {
            // 注释1-1: 注意看这里是Binder实现端服务代理处理
            return mService.calculateSignalLevel(rssi);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

WifiServiceImpl.java
以上WifiManager.java的 Binder 的实现，也是calculateSignalLevel方法的具体实现的地方

    @Override
    public int calculateSignalLevel(int rssi) {
    	// 注释1-2：这里将实现逻辑丢给了RssiUtil.java来实现
        return RssiUtil.calculateSignalLevel(mContext, rssi);
    }

RssiUtil.java
看以下代码注释1-3，信号区间的数据从xml文件读取config_wifiRssiLevelThresholds这个数组数据，全局搜索一下，最后调用的文件目录即为
packages/modules/Wifi/service/ServiceWifiResources/res/values/config.xml

public class RssiUtil {
    private RssiUtil() {}

    /** Calculate RSSI level from RSSI using overlaid RSSI level thresholds. */
    public static int calculateSignalLevel(Context context, int rssi) {
        int[] thresholds = getRssiLevelThresholds(context);

        for (int level = 0; level < thresholds.length; level++) {
            if (rssi < thresholds[level]) {
                return level;
            }
        }
        return thresholds.length;
    }

    @NonNull
    private static int[] getRssiLevelThresholds(Context context) {
    	// 注释1-3：从xml资源里读取config_wifiRssiLevelThresholds这个数组资源
        // getIntArray() will never return null, it will throw instead
        return context.getResources().getIntArray(R.array.config_wifiRssiLevelThresholds);
    }
}

LTE 的修改

修改代码路径

vendor/mediatek/proprietary/frameworks/opt/telephony-base/java/mediatek/telephony/SignalStrengthExt.java

修改逻辑

注意，是修改mapLteSignalLevel这个方法

public int mapLteSignalLevel(int mLteRsrp, int mLteRssnr, int mLteSignalStrength) {

	......
	int rssiIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
    int rsrpIconLevel = -1;
    int snrIconLevel = -1;
    if([自己项目内部定制化的开关判断]){
    	if (mLteRsrp > -44) {
        	rsrpIconLevel = -1;
    	 } else if (mLteRsrp >= -89) {
     		rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GREAT;
     	} else if (mLteRsrp >= -97) {
        	rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GOOD;
     	} else if (mLteRsrp >= -108) {
        	rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_MODERATE;
     	} else if (mLteRsrp >= -116) {
        	rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_POOR;
     	} else if (mLteRsrp >= -125) {
        	rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
     	}
    }else{
    	... 系统默认的配置 ...
    }
    
	......

}